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Background and Business Description - Redemption of Notes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net realized gains on extinguishment of debt $ 0 $ 81 $ 33
5.1% Surplus Notes, General Account, Due 2020 [Member]      
Net realized gains on extinguishment of debt   $ 134  
Nomura Credit & Capital, Inc.      
Proceeds from Legal Settlements 140    
Sitka AAC Note | Ambac Assurance Corporation [Member]      
Repayments of Long-term Debt $ 1,218    
Long-term Debt, Repayment, Premium Paid on Principal 103.00%    
Net realized gains on extinguishment of debt $ 53    
Tier 2 Notes [Member] | Ambac Assurance Corporation [Member]      
Repayments of Long-term Debt $ 213